Harken 45 mm Aluminum Block, Swivel 

Black Magic air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

SPECIFICATIONS

Sheave Ø (mm) 45 mm

Sheave Ø (in) 1 3/4 in

Length (mm) 100 mm

Length (in) 3 15/16 in

Weight (g) 79 g

Weight (oz) 2.79 oz

Shackle pin Ø (mm) 5 mm

Shackle pin Ø (in) 3/16 in

Maximum line Ø (mm) 10 mm

Maximum line Ø (in) 3/8 in

Maximum working load (kg) 750 kg

Maximum working load (lb) 1653 lb

Breaking load (kg) 1500 kg

Breaking load (lb) 3306 lb